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<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <title>Title</title>
  <link rel="stylesheet" href="stylesheets/reset.css">
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<!--
ECMAScript 5

ES6 / ES7 ...

ECMAScript 2015 || ECMAScript 6
ECMAScript 2016
...
ECMAScript 2018
...
ECMAScript 2021

'string'.replace()
'string'.replaceAll()

var function
let const import class

屎山


ts -> typescript

var i = 0 // int
i = '123'

() => {}
function() {}

new Promise()
async

Babel: es6 语法转成 es5
polyfill: 转api
-->

<div class="box">
  <span>item1</span>
  <span>item2</span>
  <span>item3</span>
  <span>item4</span>
  <span>item5</span>
</div>



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</html>
